The computed tomography (CT) of temporal bone provides exquisite bony details and excellent demonstration of soft tissue density within the air spaces of the mastoid, external auditory canal and middle ear but very limited identification of the type of substance producing the abnormal density. The study was carried out prospectively in patients suggestive of Cholesteatoma referred for HRCT at Medical College. All patients with clinical picture of cholesteatoma such as chronic ear discharge, hearing loss with or without signs of impending complications or facial palsy referred for HRCT Temporal bone. Primary acquired cholesteatoma was most commonly (70%) encountered followed by secondary acquired cholesteatomas(30%) of cases. The attic cholesteatoma was most frequently seen (46%) then extensive holo-tympanic acquired cholesteatoma (30%) followed by attico-antral cholesteatoma in (18 %). The sclerotic mastoid was the most common finding encountered in (76%) of cases. Automastoiectomy was encountered in (20%), and lateral mastoid wall fistula seen in (4%).